第１回GeoHex勉強会 第１部のプレゼン資料です。

1. GeoHex
Part 1 GeoHex
Part
@sa2da #geohex
http://geohex.net/
2010 9 4

2. Part 1 GeoHex
2010 9 4

3. GeoHex
2010 9 4

4. Hex
2010 9 4

5. CC BY-SA Original uploader was Merdal at tr.wikipedia
Plate XIX of "Studies among the Snow Crystals ... " by Wilson Bentley,
"The Snowflake Man." From Annual Summary of the "Monthly Weather
Review" for 1902.
2010 9 4

6. 1 3
(Regular Tessellation)
via. wikipedia
2010 9 4

7. GeoHex
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8. 2010 9 4

9. 2010 9 4

10. ※GoogleMaps
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11. GeoHex
VS
GeoHex GeoHex
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12. 01
→ UI
↑
↑
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13. 02
→
1 : 1.41 1:1
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14. 03
→
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15. 04
→GoogleMaps
Level:0 Level:24
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16. 05
→
→URL Twitter /
20 byte
3 - 11 byte
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17. 06
→
function getDistance(_x1,_y1, _x2,_y2)
{
_x2 = _x2 * Math.PI / 180.0;
_y2 = _y2 * Math.PI / 180.0;
_x1 = _x1 * Math.PI / 180.0;
_y1 = _y1 * Math.PI / 180.0;
var dx=_x2-_x1;
var dy=_y2-_y1;
var A = 6378137; // (6378137m)
A.x - B.x
var x = A * (dx) * Math.cos( _y1 );
var y = A * (dy);
var old_exp = exp;
dy=Math.log(Math.tan(Math.PI/4+_y2/2))-Math.log(Math.tan(Math.PI/4+_y1/2));
var rad=((dy>=0) ? 1:-1)*Math.acos(dx/Math.sqrt(dx*dx+dy*dy))*180.0/Math.PI;
var tmpdist = Math.round(Math.sqrt(x*x + y*y));
totaldist = totaldist + tmpdist;
distcnt();
}
2010 9 4

18. 07
→
35.661960,139.697900
132KpxU
35.660093,139.701741 2
.
. 3
.
. 2
. .
. .
20 × (n) byte 7 + (n) byte
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19. 08
ex) for
→
sa2da
sa2da
pinpoint
vague
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20. GeoHex
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21. 01
→
kokogiko sa2da
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22. 02
→
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23. 03
→60
→AR
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24. 04
→
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25. 05
→
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26. 06
×GeoHex
→GPS GeoHex
11/40
START GOAL
1.4km 5.2km
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27. GeoHex
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28. OK
Creative Commons License
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29. Perl
kokogiko
Ruby / GitHub
hal_sk
AS3
calcul_omikan
http://github.com/geohex/ Android
GeoHexV1
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30. PostGIS
...etc
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31. Hex
GeoHex GIS
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32. Part
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33. URL: http://geohex.net
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34. [X,Y]
4592/-1633
[X,Y]
4591/-1633 [X,Y]
4592/-1634
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35. [X,Y]
4592/-1633
[X,Y]
4591/-1633 [X,Y]
4592/-1634
2010 9 4

36. [X,Y]
4592/-1633
[X,Y]
4591/-1633 [X,Y]
4592/-1634
2010 9 4

37. [X,Y]
4592/-1633
[X,Y]
4591/-1633 [X,Y]
4592/-1634
X Y
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38. [X,Y]
4592/-1634
[X,Y] 2296/-817
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39. 17m 67m
x:168px
y:148px
135m
270m 1.1km
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40. 299909,-107087
4 19 - 15
/
18744.312,-6692.9375
h_x h_y
18744 ,-6692
h_a h_b
0.312, -0.9375
if(h_b>-h_a){
if((h_b<2*h_a)&&(h_b>0.5*h_a)){
x = h_x + 1;
h = h_y + 1;
}
}else if(h_b<-h_a+1){
if((h_b>(2*h_a)-1)&&(h_b<(0.5*h_a)+0.5)){
x = h_x;
y = h_y;
}
}else{
x = h_x + Math.round(h_a);
Y = h_y + Math.round(h_b);
}
2010 9 4

41. Y )
(+) (+
← X
→Y→
(- )←
(-)
X
(0,0)
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42. :
+85
- 85
: +180 -180
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43. WGS84 2 7 WGS84
3 Google Mercator
1
8
4
4 Google Mercator
6 Google Mercator
5 Hex
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44. /
[LEVEL] 16 [ZONE] quhN0Cn
[X,Y] 37489/-13386
uhN0Cn Y:-13386
X:37489
13386*2+1
37489*2
3600*20+60*49+38 3600*7+60*26+13
+1
abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
2010 9 4

45. http://geohex.net/{Hex }/
↑ http://geohex.net/quhN0Cn/
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46. 1/3
HTML
GeoHex
<script src="http://geohex.net/hex_v2.js" type="text/
javascript" content="text/html; charset=Shift-JIS"></script>
PROJ4 JS
<script src="http://geohex.net/lib/proj4js.js" content="text/
html; charset=shift-jis"></script>
GoogleMapsAPI V3 API
<script type="text/javascript" src="http://maps.google.com/
maps/api/js?sensor=false"></script>
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47. 2/3
PROJ4js
PROJ4
initProj4js();
※
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48. 3/3
→Hex
getZoneByLocation(lattude, longitude, level);
Hex →Hex
getZoneByCode(code);
Hex →Hex
drawHex(object ,linecolor,fillcolor,infowindow[1:on,0:off]);
Hex
-code:
-lat:
-lon:
-x: X
-y: Y
2010 9 4

49. GeoHex
GeoHex ...etc
@sa2da #geohex
sa2da@geohex.net
2010 9 4